Added parsing of <#<template>#> blocks.

compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetExpressionParsing.java

@@ -84,7 +84,8 @@ public class JetExpressionParsing extends AbstractJetParsing {
             IDENTIFIER, // SimpleName
             FIELD_IDENTIFIER, // Field reference
 
-            PACKAGE_KEYWORD // for absolute qualified names
+            PACKAGE_KEYWORD, // for absolute qualified names
+            IDE_TEMPLATE_START
     );
 
     private static final TokenSet STATEMENT_FIRST = TokenSet.orSet(
@@ -102,7 +103,7 @@ public class JetExpressionParsing extends AbstractJetParsing {
     );
 
     /*package*/ static final TokenSet EXPRESSION_FOLLOW = TokenSet.create(
-            SEMICOLON, ARROW, COMMA, RBRACE, RPAR, RBRACKET
+            SEMICOLON, ARROW, COMMA, RBRACE, RPAR, RBRACKET, IDE_TEMPLATE_END
     );
 
     @SuppressWarnings({"UnusedDeclaration"})
@@ -506,6 +507,9 @@ public class JetExpressionParsing extends AbstractJetParsing {
         if (at(LPAR)) {
             parseParenthesizedExpression();
         }
+        else if (at(IDE_TEMPLATE_START)) {
+            parseIdeTemplate();
+        }
         else if (at(HASH)) {
             parseTupleExpression();
         }
@@ -1831,6 +1835,22 @@ public class JetExpressionParsing extends AbstractJetParsing {
         parseExpression();
         argument.done(VALUE_ARGUMENT);
     }
+    
+    /*
+     * "<#<" expression ">#>"
+     */
+    private void parseIdeTemplate() {
+        PsiBuilder.Marker placeholder = mark();
+        
+        advance();
+        if (at(IDE_TEMPLATE_END)) {
+            error("Expecting IDE template");
+        } else {
+            parseExpression();
+        }
+        expect(IDE_TEMPLATE_END, "");
+        placeholder.done(PARENTHESIZED);
+    }
 
     public void parseObjectLiteral() {
         PsiBuilder.Marker literal = mark();

compiler/frontend/src/org/jetbrains/jet/lexer/Jet.flex

@@ -197,6 +197,8 @@ LONG_TEMPLATE_ENTRY_END=\}
 \!in{IDENTIFIER_PART}        { yypushback(3); return JetTokens.EXCL; }
 \!is{IDENTIFIER_PART}        { yypushback(3); return JetTokens.EXCL; }
 
+"<#<"        { return JetTokens.IDE_TEMPLATE_START    ; }
+">#>"        { return JetTokens.IDE_TEMPLATE_END    ; }
 "==="        { return JetTokens.EQEQEQ    ; }
 "!=="        { return JetTokens.EXCLEQEQEQ; }
 "!in"        { return JetTokens.NOT_IN; }

compiler/frontend/src/org/jetbrains/jet/lexer/JetTokens.java

@@ -114,6 +114,9 @@ public interface JetTokens {
     JetToken HASH        = new JetToken("HASH");
     JetToken AT          = new JetToken("AT");
     JetToken ATAT          = new JetToken("ATAT");
+    
+    JetToken IDE_TEMPLATE_START = new JetToken("IDE_TEMPLATE_START");
+    JetToken IDE_TEMPLATE_END = new JetToken("IDE_TEMPLATE_END");
 
     TokenSet LABELS = TokenSet.create(AT, ATAT, LABEL_IDENTIFIER);